Maybe Obama should have been charged, just to set the record straight, but likely this wasn’t attempted because (1) Trump was too busy grifting to put any weight behind this, (2) all of those killed were on foreign soil, and (3) they were all working with Al Qaeda. This is getting into the realm of whether or not killing an enemy combatant is murder and what really defines an enemy combatant. I’m sure there was also pressure from both sides to specifically not answer these questions.

Either way I’d rather live in a country where a President gets charged after leaving office as a rule, than live in a country where a President can practically burn everything to the ground and walk away untouched.